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3 years ago

What is the answer to x+1/2=5

Mathematics

2 answers:

jonny [76]3 years ago

6 0

X= 4.5 or 9/2

subtract 1/2 to move it to the other side (x=5-1/2)
subtract 5-1/2

Katen [24]3 years ago

3 0

Answer:

x=4.5

Step-by-step explanation:

get x on one side by subtracting 1/2 on both sides

5-1/2 = 4.5

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1/7 divided by 3<br> Is it 1/3 or 1/2 im so confuse

larisa86 [58]

<h3><u>given</u><u>:</u></h3>

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2 years ago

A true-false quiz with 10 questions was given to a statistics class. Following is the probability distribution for the score of

disa [49]

Answer:

$E(X)=\sum_{i=1}^n X_i P(X_i)$

And if we use the values obtained we got:

$E(X)=5*0.05 +6*0.15 +7*0.33 +8*0.28+ 9*0.12 +10*0.07=7.48$

For this case this value means that the expected score is about 7.48

Step-by-step explanation:

For this case we assume the following probability distribution:

X 5 6 7 8 9 10

P(X) 0.05 0.15 0.33 0.28 0.12 0.07

First we need to find the expected value (first moment) and the second moment in order to find the variance and then the standard deviation.

In order to calculate the expected value we can use the following formula:

$E(X)=\sum_{i=1}^n X_i P(X_i)$

And if we use the values obtained we got:

$E(X)=5*0.05 +6*0.15 +7*0.33 +8*0.28+ 9*0.12 +10*0.07=7.48$

For this case this value means that the expected score is about 7.48

In order to find the standard deviation we need to find first the second moment, given by :

$E(X^2)=\sum_{i=1}^n X^2_i P(X_i)$

And using the formula we got:

$E(X^2)=(5^2 *0.05)+(6^2 *0.15)+(7^2 *0.33)+(8^2 *0.28)+ (9^2 *0.12 +(10^2 *0.07))=57.46$

Then we can find the variance with the following formula:

$Var(X)=E(X^2)-[E(X)]^2 =57.46-(7.48)^2 =1.5096$

And then the standard deviation would be given by:

$Sd(X)=\sqrt{Var(X)}=\sqrt{1.5096}=1.229$

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4 years ago

Read 2 more answers

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alekssr [168]

Answer:

$4.78

Step-by-step explanation:

subtract 6.10 from 30 = 24.90

then divide it by 5

ans : $4.78

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3 years ago

145 pounds to 132 pounds

Slav-nsk [51]

Decrease of 13 pounds

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4 years ago

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Answer:

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Maria - 3 chocolates consider as variable Y

Aaliyah bought c times as Maria

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3 years ago